It is the most economical, cleanest, and most environmentally friendly: from point of view on the resource conditions, especially land use, bio-energy and wind energy demand relatively harder conditions, but the conditions solar energy needs are very flexible and broad. If solar power takes up a land area of 1, the wind will be 8-10 the area of the solar energy takes up, and bio-energy even needs100 times. To the water and electricity, building a large dam often requires tens to hundreds of square kilometers of submerged land. In contrast, solar power does not take up more of additional land, The roof or walls may become a place of its application. In our country, we can also use our vast desert, through the construction of solar power in the desert base, directly reduce the direct solar radiation to the surface of the desert area, thus to reduce the surface temperature, and evaporation, and thereby make the plant survival and growth to a certain extent possible, secure and reduce the sand dunes, and also obtain a clean and renewable energy we need from the nature.